Sheet Metal and Metal Plate Framing Devices

Dozens of ingenious sheet metal and metal plate devices are manufactured for strengthening common connections in wood framing. The most frequently used is the joist hanger, but all  of the devices shown in Figures 3.45 and 3.46 find extensive use. There are two parallel series of this type of  device, one made of sheet metal for  use in light framing and one made of  thicker metal plate for heavy timber  and laminated wood framing. The  devices for light framing are attached  with nails and the heavier devices  with bolts or lag screws. Where such framing devices will be exposed to  the weather or to lumber treated  with corrosive chemical treatments,  they should be made from corrosion- resistant metal such as heavily galvanized steel or stainless steel. To  prevent galvanic corrosion between  dissimilar metals, fasteners for metal  framing devices should always be  made of the same material as the  framing device: Galvanized framing  devices should be fastened with galvanized fasteners, and stainless steel  devices should be fastened with stain-less steel fasteners.

Figure 3.45 Joist hangers are used to make strong connections in fl oor framing wherever wood
joists bear on one another at right angles. They are attached with special short nails
driven through the holes punched in the hangers. The heavier steel beam hangers
are used primarily in laminated wood construction. Post bases serve the twofold
function of preventing water from entering the end of the post and anchoring the
post to the foundation. The bolts and lag screws used to connect the wood members
to the heavier connectors are omitted from this drawing.
Figure 3.46 The sheet metal connectors shown in this
diagram are less commonly used than
those in Figure 3.45, but are invaluable
in solving special framing problems and
in reinforcing frames against wind uplift
and earthquake forces.

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